Daniel euggles



`D. RUGGLES. Screw Propeller.v e

No. 242,842. Patented June 14, |881.I

UNITED STATES PATENTA OFFICE.

DANIEL RUGGLES, OF FREDERIGKSBURG, ASSIGNOR TO EDWARD S. RUG- GLES, OF FRIEDLAND, VIRGINIA.

SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent No. 242,842, dated June 114:, 1881.

Application filed July 12, 187B.

To all whom it may concern:

Be it known that I, DANIEL RUGGLES, of Fredericksburg, in the county of Spottsylvania and State of Virginia, have invented a new and uset'ul Machine or Mechanical Oombination for Evolving and 'Iransmitting Force or Power, which is substantially set forth in the following specification and accompanying drawings, in which- Figure l is a perspective view of a hollow or open double-conical spiral screw, increasing its diameter each way from a point central of its length, attached by radial braces toa central axis, C D, and constructed with liattened or curvilinear metallic or non-metallic threads or ianges of a breadth, size, and spiral form convertible in position as well as in angular bearing upon said axis to meet every requirement of a screw-propeller, (see crank or axis c d, bearings ef g h.) Y

The said machine is to be used single7 or multiple, movable or stationary, for all practicable mechanical combinations, and to be used eithei1 within or without a cylindrical casing, E F, either attached or free in the water or in the atmosphere, as may be expedient, as a hollow or open conical spiral screwpropeller, and for any and all other purposes, to be driven by steam or other power for advancing or to retire by inversion.

The spiral iianges or threads are to be made solid or tubular, and, when tubular, to be op- 

